I thought Mowgli put it very well: CRM isn't about being "fluffy" it's about getting the best out of people. The phrase "appropriate behaviour" is sometimes used to illustrate the fact that there are times when, as in maximum's scenario, there's no time for much of a debate. When there's absolutely no time, then even "autocratic" behaviour is appropriate.
The problem for some FOs is to recognise that the Captain decides, and once the decision is made the time for debate has passed. CRM training does not always make this clear enough, concentrating too much on the best way of conducting that debate.
This seems a good opportunity to record my gratitude to the copilots who so often, and so tactfully, kept me out of the poo!